01 -
Prepare rough puff pastry dough through second refrigeration, or thaw store-bought puff pastry. Refrigerate dough until ready for shaping.
02 -
In a medium saucepan over medium heat, combine apples, cornstarch, vanilla, cinnamon, and sugar. Stir constantly for 5 minutes. Reduce heat to low and simmer for another 5 minutes. Remove from heat and cool for 20 minutes.
03 -
Line two large baking sheets with parchment paper or silicone baking mats and set aside.
04 -
For homemade dough: On a lightly floured surface, roll out puff pastry to a 12-inch square. Cut into nine 4-inch squares using a pizza cutter or sharp knife and transfer to prepared baking sheets. For store-bought: Unroll pastry sheets and cut each into four squares, placing them on the baking sheets.
05 -
Spoon 2 to 3 tablespoons of apple filling onto the center of each square. Fold corner to form a triangle and crimp the edges with a fork to seal. Chill turnovers in the refrigerator for at least 15 minutes and up to 1 hour.
06 -
Preheat oven to 400°F (204°C). In a bowl, whisk together egg and milk. Brush egg wash over each chilled turnover and cut 2 or 3 small slits on top to vent steam.
07 -
Bake turnovers for 23 to 25 minutes or until golden brown, rotating baking sheets halfway through for even color.
08 -
Allow turnovers to cool on baking sheets for 5 minutes. Drizzle with salted caramel if desired before serving.
09 -
Store leftovers covered at room temperature for up to 1 day or in the refrigerator for up to 5 days.